Balloon holder base



FIG. 1 is a perspective view of a balloon holder base;

FIG. 2 is a top view of the balloon holder base of FIG. 1; and,

FIG. 3 is a side view of the balloon holder base of FIG. 1.

The broken lines showing of portions of the balloon holder base areincluded for the purpose of illustrating environmental structure andform no part of the claimed design. All surfaces not shown form no partof the claimed design.

CLAIM The ornamental design for a balloon holder base, as shown anddescribed.